There is one for each barrel. The back one is for the left hand barrel and the front is for the right hand barrel.
50-100 or so
The front trigger opened the breach.
over 9000!
50-100 USD
Library, gun shows, Spain.
0-250 USD depending on condition.
Blue Book of Gun Values will help.
Blue Book of Gun Values
It would top out at $250 as a mantle decoration. Unless you mean a Parker Brothers shotgun. Then it could be several thousand dollars.
50-150 USD or so
The back one is for the left hand barrel and the front is for the right hand barrel.
I have The New England Double barrel shotgun with 32 inch barrel single trigger and im looking for the same thing.